158 lines
4.4 KiB
C
158 lines
4.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini touch implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m, -r, -t not supported. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Previous version called open() and then utime(). While this will be
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* be necessary to implement -r and -t, it currently only makes things bigger.
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* Also, exiting on a failure was a bug. All args should be processed.
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*/
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#include "libbb.h"
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//config:config TOUCH
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//config: bool "touch"
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//config: default y
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//config: help
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//config: touch is used to create or change the access and/or
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//config: modification timestamp of specified files.
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//applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
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//kbuild:lib-$(CONFIG_TOUCH) += touch.o
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//usage:#define touch_trivial_usage
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//usage: "[-c]" IF_DESKTOP(" [-d DATE] [-r FILE]") " FILE [FILE]..."
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//usage:#define touch_full_usage "\n\n"
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//usage: "Update the last-modified date on the given FILE[s]\n"
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//usage: "\nOptions:"
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//usage: "\n -c Don't create files"
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//usage: IF_DESKTOP(
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//usage: "\n -d DT Date/time to use"
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//usage: "\n -r FILE Use FILE's date/time"
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//usage: )
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//usage:
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//usage:#define touch_example_usage
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//usage: "$ ls -l /tmp/foo\n"
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//usage: "/bin/ls: /tmp/foo: No such file or directory\n"
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//usage: "$ touch /tmp/foo\n"
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//usage: "$ ls -l /tmp/foo\n"
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//usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n"
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/* This is a NOFORK applet. Be very careful! */
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/* coreutils implements:
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* -a change only the access time
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* -c, --no-create
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* do not create any files
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* -d, --date=STRING
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* parse STRING and use it instead of current time
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* -f (ignored, BSD compat)
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* -m change only the modification time
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* -r, --reference=FILE
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* use this file's times instead of current time
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* -t STAMP
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* use [[CC]YY]MMDDhhmm[.ss] instead of current time
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* --time=WORD
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* change the specified time: WORD is access, atime, or use
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*/
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int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int touch_main(int argc UNUSED_PARAM, char **argv)
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{
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int fd;
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int status = EXIT_SUCCESS;
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int opts;
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#if ENABLE_DESKTOP
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# if ENABLE_LONG_OPTS
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static const char touch_longopts[] ALIGN1 =
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/* name, has_arg, val */
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"no-create\0" No_argument "c"
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"reference\0" Required_argument "r"
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"date\0" Required_argument "d"
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;
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# endif
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char *reference_file = NULL;
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char *date_str = NULL;
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struct timeval timebuf[2];
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timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
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#else
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# define reference_file NULL
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# define date_str NULL
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# define timebuf ((struct timeval*)NULL)
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#endif
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#if ENABLE_DESKTOP && ENABLE_LONG_OPTS
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applet_long_options = touch_longopts;
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#endif
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/* -d and -t both set time. In coreutils,
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* accepted data format differs a bit between -d and -t.
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* We accept the same formats for both */
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opts = getopt32(argv, "c" IF_DESKTOP("r:d:t:")
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/*ignored:*/ "fma"
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IF_DESKTOP(, &reference_file)
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IF_DESKTOP(, &date_str)
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IF_DESKTOP(, &date_str)
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);
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opts &= 1; /* only -c bit is left */
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argv += optind;
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if (!*argv) {
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bb_show_usage();
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}
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if (reference_file) {
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struct stat stbuf;
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xstat(reference_file, &stbuf);
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timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
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}
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if (date_str) {
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struct tm tm_time;
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time_t t;
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//memset(&tm_time, 0, sizeof(tm_time));
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/* Better than memset: makes "HH:MM" dates meaningful */
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time(&t);
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localtime_r(&t, &tm_time);
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parse_datestr(date_str, &tm_time);
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/* Correct any day of week and day of year etc. fields */
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tm_time.tm_isdst = -1; /* Be sure to recheck dst */
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t = validate_tm_time(date_str, &tm_time);
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timebuf[1].tv_sec = timebuf[0].tv_sec = t;
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}
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do {
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if (utimes(*argv, (reference_file || date_str) ? timebuf : NULL) != 0) {
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if (errno == ENOENT) { /* no such file */
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if (opts) { /* creation is disabled, so ignore */
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continue;
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}
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/* Try to create the file */
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fd = open(*argv, O_RDWR | O_CREAT, 0666);
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if (fd >= 0) {
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xclose(fd);
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if (reference_file || date_str)
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utimes(*argv, timebuf);
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continue;
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}
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}
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status = EXIT_FAILURE;
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bb_simple_perror_msg(*argv);
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}
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} while (*++argv);
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return status;
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}
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